Screw mounting kit specifications?

4 pcs: PM4.0*6.5, round head cross recess machine screw; head: D6.8mm×T2.7mm, black zinc plated (48H salt spray resistance) 

2 pcs: Special-shaped screw M3.0*10.2; large head: D8.0mm×H2.6mm, small head: D4.4mm×H3.6mm, thread length: 4.0mm; cylinder head cross recess machine screw, black zinc plated (48H salt spray resistance) 

4 pcs: CM3.0*3.5, cylinder head cross recess machine screw; head: D6.7mm×T1.2mm, black zinc plated (48H salt spray resistance), with thread locking patch